Lambert gave his new striker a debut in defeat to Newcastle United.
"He's a handful, he's played in a league renowned for some of the hardest defending you can come up against.
"It's really tough to get away from a defender in Italy. His goalscoring in the Europa League was incredible.
"He scored a brilliant goal the other night against Italy in a real high-pressure game.
"I don't bring players in to say: 'You can sit on the bench for six months.'
"He's here to help and that's what he'll do.
"We've got options now. I can do what I want because he's a No.9, which is what I think we've needed."
For the big stories and the banter follow us on Twitter: @tribalfootball